Casing centralizer having spiral blades



FIG. 1 is a perspective view of a casing centralizer showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view.

The broken lines showing a cylinder are included for the purposes of illustrating only and form no part of the claimed design. 

CLAIM The ornamental design of casing centralizer having spiral blades, substantially as shown and described. 